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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436de587672b38defa8d8b9574bb9ca3ce3fa4fde90d151177e8ae6d53d84b6b' 
  AND token = 'DXHsdENDbia82sIViuUVjN57UqPxjeE5Nb7pTenzJP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}